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IO Biotech Inc (IOBT)

CUSIP: 449778109 | NYSE | Healthcare · Biotechnology | Micro Cap | 73 institutional holders

Quarters

Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025
CompareDetailedHistoricalFundsOptions13D/13GPeersTargetingTrading SummaryProfile

Beneficial Ownership — 13D / 13G

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5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

HolderShares% of ClassChangeEvent Datevs 13F
13D/ALundbeckfond Invest A/S21,851,92027.4%New 5%+ stakeMar 31, 2026No 13F filer matched
13D/ANovo Holdings A/S2,469,1353.3%Newly reportedJan 21, 20262,512,453 sh (Dec 31, 2025)
13D/ALundbeckfond Invest A/S21,851,920
27.4% of class · Mar 31, 2026New 5%+ stake
No 13F filer matched
13D/ANovo Holdings A/S2,469,135
3.3% of class · Jan 21, 2026Newly reported
2,512,453 sh (Dec 31, 2025)

Institutional Holders — Q1 2026

Ikarian Capital, LLC1,386,565
0.0% of portfolio›$81.4K
Boothbay Fund Management, LLC451,852
0.0% of portfolio›$26.5K
GSA Capital Partners LLP348,352
0.0% of portfolio›$20
Marshall Wace, LLP301,291
0.0% of portfolio›$18.1K
XTX Topco Ltd265,792
0.0% of portfolio›$15.6K
Morgan Stanley206,215
0.0% of portfolio›$12.1K
Millennium Management LLC194,158
0.0% of portfolio›$11.4K
Citigroup Inc72,495
0.0% of portfolio›$4.3K
Jane Street Group, LLC57,974
0.0% of portfolio›$3.4K
Beacon Pointe Advisors, LLC42,600
0.0% of portfolio›$2.5K
Geode Capital Management, LLC33,307
0.0% of portfolio›$2.0K
UBS Group AG30,980
0.0% of portfolio›$1.8K
StyleTurnoverLocationFiled
Ikarian Capital, LLC
1,386,565$81.4K0.0%Deep ValueVery HighDallas, TX2026-05-15
Boothbay Fund Management, LLC
451,852$26.5K0.0%ValueVery HighNew York, NY2026-05-15
GSA Capital Partners LLP
348,352$200.0%Deep ValueVery HighLondon, United Kingdom2026-05-08
Marshall Wace, LLP
301,291$18.1K0.0%GARPHighLondon, United Kingdom2026-05-15
XTX Topco Ltd
265,792$15.6K0.0%ValueVery HighLondon, United Kingdom2026-05-15
Morgan Stanley
206,215$12.1K0.0%CoreLowNew York, NY2026-05-15
Millennium Management LLC
194,158$11.4K0.0%CoreVery HighNew York, NY2026-05-15
Citigroup Inc
72,495$4.3K0.0%CoreMediumNew York, NY2026-05-11
Jane Street Group, LLC
57,974$3.4K0.0%CoreVery HighNew York, NY2026-05-12
Beacon Pointe Advisors, LLC
42,600$2.5K0.0%ETFLowNewport Beach, CA2026-05-15
Geode Capital Management, LLC
33,307$2.0K0.0%IndexVery LowBoston, MA2026-05-15
UBS Group AG
30,980$1.8K0.0%CoreMediumZurich, Switzerland2026-05-05